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authorTom Gundersen <teg@jklm.no>2014-05-16 00:50:44 +0200
committerTom Gundersen <teg@jklm.no>2014-07-28 10:44:51 +0200
commit615c1467c81411bf1d19fd7092e8995b5ebadc13 (patch)
tree9996462fadab28640b5ccda87227a8ba125e4eb1 /src/libsystemd-network
parent0af03ba57f43b973463e15949c2830cbd228f19d (diff)
sd-dhcp-client: add support for FORCERENEW
This partially implements RFC3203. Note that we are not fully compliant as we do not support authentication.
Diffstat (limited to 'src/libsystemd-network')
-rw-r--r--src/libsystemd-network/dhcp-protocol.h2
-rw-r--r--src/libsystemd-network/sd-dhcp-client.c44
2 files changed, 37 insertions, 9 deletions
diff --git a/src/libsystemd-network/dhcp-protocol.h b/src/libsystemd-network/dhcp-protocol.h
index 7c06b5ab68..f5119a7a58 100644
--- a/src/libsystemd-network/dhcp-protocol.h
+++ b/src/libsystemd-network/dhcp-protocol.h
@@ -95,6 +95,8 @@ enum {
DHCP_ACK = 5,
DHCP_NAK = 6,
DHCP_RELEASE = 7,
+ DHCP_INFORM = 8,
+ DHCP_FORCERENEW = 9,
};
enum {
diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index 68bce5e459..8205ad0e18 100644
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -862,7 +862,6 @@ static int client_timeout_t1(sd_event_source *s, uint64_t usec,
void *userdata) {
sd_dhcp_client *client = userdata;
DHCP_CLIENT_DONT_DESTROY(client);
- int r;
client->state = DHCP_STATE_RENEWING;
client->attempt = 1;
@@ -916,6 +915,19 @@ static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer,
return 0;
}
+static int client_handle_forcerenew(sd_dhcp_client *client, DHCPMessage *force,
+ size_t len) {
+ int r;
+
+ r = dhcp_option_parse(force, len, NULL, NULL);
+ if (r != DHCP_FORCERENEW)
+ return -ENOMSG;
+
+ log_dhcp_client(client, "FORCERENEW");
+
+ return 0;
+}
+
static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack,
size_t len) {
_cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
@@ -1226,9 +1238,20 @@ static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message,
break;
+ case DHCP_STATE_BOUND:
+ r = client_handle_forcerenew(client, message, len);
+ if (r >= 0) {
+ r = client_timeout_t1(NULL, 0, client);
+ if (r < 0)
+ goto error;
+ } else if (r == -ENOMSG)
+ /* invalid message, let's ignore it */
+ return 0;
+
+ break;
+
case DHCP_STATE_INIT:
case DHCP_STATE_INIT_REBOOT:
- case DHCP_STATE_BOUND:
break;
@@ -1285,13 +1308,6 @@ static int client_receive_message_udp(sd_event_source *s, int fd,
return 0;
}
- if (be32toh(message->xid) != client->xid) {
- log_dhcp_client(client, "received xid (%u) does not match "
- "expected (%u): ignoring",
- be32toh(message->xid), client->xid);
- return 0;
- }
-
if (message->htype != ARPHRD_ETHER || message->hlen != ETHER_ADDR_LEN) {
log_dhcp_client(client, "not an ethernet packet");
return 0;
@@ -1304,6 +1320,16 @@ static int client_receive_message_udp(sd_event_source *s, int fd,
return 0;
}
+ if (client->state != DHCP_STATE_BOUND &&
+ be32toh(message->xid) != client->xid) {
+ /* in BOUND state, we may receive FORCERENEW with xid set by server,
+ so ignore the xid in this case */
+ log_dhcp_client(client, "received xid (%u) does not match "
+ "expected (%u): ignoring",
+ be32toh(message->xid), client->xid);
+ return 0;
+ }
+
return client_handle_message(client, message, len);
}